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Castle Island

Castle Island is a peninsula in South Boston on the shore of Boston Harbor. The landmass was an island until 1928, when it was connected to the mainland by a narrow strip of land. Castle Island has been the site of a fortification since 1634, and is currently a recreation site and the location of Fort Independence.

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Updated 29 Sept 2026. Something wrong? Tell us.

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SeeFortSouth Boston
Fort Independence
A star fort built around 1850 to provide defenses for Boston harbor. Today, the guns are long gone, and it's a great place to go exploring. Fantastic views are rewarded to those who scale its granite walls. Even if the fort is closed, the grounds are always open. It's a great place to see families picnicking, going for a stroll around Pleasure Bay, or out flying kites in the brisk wind blowing in from the water. Kids love seeing (and hearing!) the planes up close, as they make their final approach to Logan Airport.
Thu 7PM-dusk, Sat Sun noon-3:30PMFree
EatAmerican restaurantSouth Boston
Sullivan's Castle Island
Not to be missed South Boston dining experience. No frills beachside shack in business since the 1950s. No indoor seating. Lines are long during summer hours, but they move fast. If the weather is bad, you'll have the place to yourself.
8:30AM-6PM dailyLobster roll $13
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Pleasure Bay
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Head Island
Head Island Causeway